The two picks are nice. I also agree that he should be effective against both sides of the plate. I just think that using him for specialist work is a way to keep the workload under control. This is not a healthy pitcher. Also, there should be a lot of call for specialist work, and since the Yankees have 4 switch hitters in their starting lineup and 2 other lefthanders, there will be work for Wagner in key spots in that role.
The fact that he's also effective against RHH means that you can turn a switch hitter around with him. that's also useful, especially if you want to get Teixeira or Swisher pulling to left, rather than into the jet stream in Yankee stadium's right field.